Volatile anesthetic vaporizing apparatus

ABSTRACT

A filling system and means for preventing the introduction of an incorrect liquid into the body of volatile anesthetic vaporising apparatus and having complementary interengaging male and female parts of which one is on the said body and the other is on the end of a flexible liquid feed conduit attached to a filler bottle. The conduit is an air tube within a liquid passage forming tube and the said body part provides a valve controlled outlet.

United States Patent [72] Inventor Wilfred Jones [56] References CitedRiddlesden, Englan UNITED STATES PAT N 1 1 pp 733,949 1 712 470 5/1929 PE TS [221 Filed $16,196,; ray 141/309 2,914,097 11/1959 Battmlch141/308X [45] Patented Feb. 23 1971 3,139,123 6/1964 L1sc1an1....141/309X [73) g 'gg 3 142 320 7/1964 Olson 14 7 9 Hg ey, n8 PriorityJan. 5 1968 3,459,245 8/1969 Schrerber et a1 141/292 [33] Great B it iPrimary Examiner-Mark M. Newman [31] 823/68 Attorney-Russet, Smith &Harding [54] VOLATILE ANAESTHETIC VAPORISING APPARATUS ABSTRACT- Afillin y g system and means for preventing the m- 4Clmms3Drawmg Figstroduction of an incorrect liquid into the body of volatile [52] US. Cl.14-1/308, anaesthetic vaporising apparatus and having complementary141/302, 141/309 interengaging male andfemale parts of which one is onthe [51] Int. Cl. 3651) 3/06, said body and the other is on the end of aflexible liquid feed B65b 3/ 18 conduit attached to a filler bottle. Theconduit is an air tube [50] Field of Search 141/285, within a liquidpassage forming tube and the said body part 301, 308 (Earles), 309, 302

provides 'a valve controlled outlet.

This invention relates to apparatus capable of mixing the vapor of avolatile liquid anesthetic with a gaseous fluid, such as air, oxygen, ornitrous oxide, or a combination thereof, all

' of which for convenience are hereinafter included in the term gas.

It is considered that the apparatus should be used only for one type ofvolatile anesthetic although it is known for the apparatus to be usedfor different types with a cleaning operation between the changes.

In view of the above this invention is concerned with ensuring that onlya given type of liquid anesthetic can be poured into the apparatus froma supply container which is usually a glass bottle, and it is the mainobject of this invention to provide a safety-type filling system andmeans for this purpose.

Accordingly there is provided a filling system for volatile liquidanesthetic apparatus, including an inlet device on the wall of theliquid receiving body of the apparatus, an inlet opening in said device,a separate conduit having at one end an outlet member to enter saidopening and at its other end a cap connection to be secured onto theneck of a bottle, air and liquid passages through the conduit" and itsends to facilitate the flow of liquid from the bottle into said body,said conduit outlet member and its receiving inlet opening in saiddevice being complementary in a manner that ensures only the cor- .recttype of member can be fully inserted and thus a correct type of liquidintroduced into the apparatus.

The invention includes an inlet device forming part of the wall of theaforesaid body, said device including means for retaining the aforesaidoutlet member of the conduit and means for closing the opening when themember is withdrawn. The said device may incorporate a drainage controlvalve and outlet passage. Said outlet passage may terminate in an outletopening adapted to receive the aforesaid conduit outlet .member fordraining liquid from the body into a bottle.

The conduit outlet member may have an outlet hole and an inlet hole forseparating the air and liquid passages. Moreover, said member may have aslot to collaborate with a location ,peg in the inlet opening to receivethe member.

I The invention will now be more particularly described with referenceto the accompanying drawings, in which:

FIG. 1 is a sectional elevation of the liquid anesthetic filling deviceon a vaporizer;

FIG. 2 is a sectional elevation of the conduit and bottle for connectionto the filling device; and FIG. 3 is a sectional elevation of thefilling device and conduit in engagement.

In the illustrated embodiment of this invention a filler block .1 issecured to the sidewall of the body 2 of liquid anesthetic apparatus toprovide means for the introduction of liquid anesthetic 3. This blockincorporates an inlet opening 4 of cross-sectional shape (it may berectangular or other shape) which is complementary to an outlet member 5on the end of a flexible conduit 6 which incorporates air and liquidflow passages 7 and 8 leading respectively to and from openings 6a and7a in the member. The arrangement is such that only an outlet member 5of the correct shape and size or other formation, can enter fully intothe opening 4. Conveniently, the member 5 has a slot 9 to register witha location peg 10 which projects into the opening 4 at a predeterminedpoint. A liquid feed-air outlet passageway 11 leads from feed and airholes 12 and 13 leading from the said opening 4 to communicate with anopening 14 in the wall of the body of the apparatus for introducingliquid thereinto. To hold an outlet member 5 in position in the opening4, a locking screw 15 is provided in the head of the block 1, and suchhead may be a separable part of the block. The other end of the conduit6 is in the form of an internally screw-threaded cap 16 to be screwed onto the neck 17 of a known formof liquid containing bottle 18. Thearrangement is preferably such that there is no need to redesign theformation ,of the bottle neck 17 but the cap can be arranged to fit onlythe neck of a bottle containing a given drug. In one known convenientform the bottle is closed by a removable rubber or other flexible sealor disc normally enclosed by a screw-on cover cap. Such cap and disc canreadily be removed for the location of the conduit cap 16 incorporatinga flanged conduit connection element 19 which has a part 20 for locatingthe air tube 7. A sealing washer 21 is located between the elementflange and the neck 17 to provide a liquidand airtight seal. The conduitoutlet member 5 can be pushed into the aforesaid inlet opening 4,secured by the screw 15 and the bottle inverted for liquid to flowtherefrom into the body 2 to a given level. During the filling operationair flows out through the passageway 11, the hole 13, opening 7a andpassage 7 into the bottle 18. The conduit is removed and a closure plug22 (or other means) with a gripping knob 23 used to close the inletopening 4. This plug has a slot 24 to register with the pin 10 and itcloses the two holes 12 and 13.

The aforesaid supply block 1 includes a liquid drainage section 25. Forexample, a cranked (or other) drainage passage 26 leads from the bottomof the feed passageway 11 and into a small valve chamber 27 controlledby a valve 28 in a screwthreaded bore 29. A further passage 30 leadsfrom the chamber to a drainage outlet opening 31. The latter may be asingle opening for the outflow of liquid when the valve 28 is released(screwed back) but such outlet opening is preferably of the sameformation as the aforesaid inlet opening 4 with a location peg 32 sothat the conduit member 5 can be inserted thereinto for draining liquidback into a bottle 18 through the same (or another) conduit 6. Thislower section 25 of the block 1 may be a detachable part from the mainblock. Moreover, if so desired, this outlet section may be constructedso that it is optional whether drainage is out through a conduit orthrough another direct drainage opening normally closed by a closureplug or cap.

It will be understood that the use of a flexible conduit allows thebottle to be held, inverted for supply and upright for drainage, atdifferent levels to control the rate of flow of the liquid anesthetic.

I claim:

1. Apparatus for introducing liquid anesthetic into a liquid receivingbody of anesthetic apparatus, comprising a unit mounted at a selectedheight on a sidewall of said body, a connection passageway allowing flowof liquid from said unit to said body and flow of air from said body tosaid unit, an inlet opening in said unit above said connectionpassageway, said inlet opening being of a sele cted shape and size,separate air and liquid passagesbetwen said connection passageway andthe lower side of said inlet opening, a separable connection membercomplementary to said inlet opening, interference means for ensuringthat only a connection member of predetermined form can enter said inletopening, means securing said connection member in said inlet opening, aflexible conduit carrying said connection member at a first end thereof,said conduit comprising an air flow passage and a liquid flow passage,said connection member when secured in said inlet opening connectingsaid air and liquid flow passages of said conduit respectively with saidair and liquid passages between said connection passageway and saidinlet opening, a screw-on cap at a second end of said flexible conduitfor attachment to a liquid containing bottle having a predetermined formof screw-threaded neck, outlet means from said body, an outlet openingin said outlet means, said outlet opening being complementary to saidinlet opening and having interference means for ensuringthat only saidconnection member of said predetermined form can enter saidoutletopening, and a valve for controlling liquid flow through said outletmeans.

2. Apparatus in accordance with claim 1 wherein said means securing saidconnection member in said inlet opening is a screw screwable intoengagement with said connection member.

3. Apparatus in accordance with claim 1 wherein said conduit comprises aflexibleouter tube constituting said liquid flow passage and a flexibleinner tube lying within said outer tube and constituting said air flowpassage, and retaining means are included in said screw-on cap forretaining the end of said inner tube at an angle to the axis of saidscrew-on cap.

4. Apparatus for introducing liquid anesthetic into a liquidreceivingbody of anesthetic apparatus, comprising a unit mounted at a selectedheight on a sidewall of said body, a first connection passagewayallowing flow of liquid from said unit to said body and flow of air fromsaid body to said unit, an inlet opening in said unit above said firstconnection passageway, said inlet opening being of a selected shape andsize, separate air and liquid passages between said first connectionpassageway and the lower side of said inlet opening, a separableconnection member complementary to said inlet opening, interferencemeans for ensuring that only a connection member of predetermined formcan enter said inlet opening, means securing said connection member insaid inlet opening, a flexible conduit carrying said connection memberat a first end thereof, said conduit comprising an air flow passage anda liquid flow passage, said connection member when secured in said inletopening connecting said air and liquid flow passages of said conduitrespectively with said air and liquid passages between said firstconnection passageway and said inlet opening, a screw-on cap at a secondend of said flexible conduit for attachment to a liquid containingbottle having a predetermined form of screw-threaded neck, a secondconnection passageway below said first connection passageway allowingflow of liquid from the body to the unit, an outlet opening in said unitlocated below said second connection passageway, saidoutlet openingcommunicating with said second connection passageway, said outletopening being complementary to said inlet opening and havinginterference means for ensuring that only said connection member of saidpredetermined form can enter said outlet opening to connect said secondconnection passageway to said liquid flow passage in said conduit todrain liquid from said body, and a valve in said unit to control liquidflow through said second connection passageway.

1. Apparatus for introducing liquid anesthetic into a liquid receivingbody of anesthetic apparatus, comprising a unit mounted at a selectedheight on a sidewall of said body, a connection passageway allowing flowof liquid from said unit to said body and flow of air from said body tosaid unit, an inlet opening in said unit above said connectionpassageway, said inlet opening being of a selected shape and size,separate air and liquid passages between said connection passageway andthe lower side of said inlet opening, a separable connection membercomplementary to said inlet opening, interference means for ensuringthaT only a connection member of predetermined form can enter said inletopening, means securing said connection member in said inlet opening, aflexible conduit carrying said connection member at a first end thereof,said conduit comprising an air flow passage and a liquid flow passage,said connection member when secured in said inlet opening connectingsaid air and liquid flow passages of said conduit respectively with saidair and liquid passages between said connection passageway and saidinlet opening, a screw-on cap at a second end of said flexible conduitfor attachment to a liquid containing bottle having a predetermined formof screw-threaded neck, outlet means from said body, an outlet openingin said outlet means, said outlet opening being complementary to saidinlet opening and having interference means for ensuring that only saidconnection member of said predetermined form can enter said outletopening, and a valve for controlling liquid flow through said outletmeans.
 2. Apparatus in accordance with claim 1 wherein said meanssecuring said connection member in said inlet opening is a screwscrewable into engagement with said connection member.
 3. Apparatus inaccordance with claim 1 wherein said conduit comprises a flexible outertube constituting said liquid flow passage and a flexible inner tubelying within said outer tube and constituting said air flow passage, andretaining means are included in said screw-on cap for retaining the endof said inner tube at an angle to the axis of said screw-on cap. 4.Apparatus for introducing liquid anesthetic into a liquid-receiving bodyof anesthetic apparatus, comprising a unit mounted at a selected heighton a sidewall of said body, a first connection passageway allowing flowof liquid from said unit to said body and flow of air from said body tosaid unit, an inlet opening in said unit above said first connectionpassageway, said inlet opening being of a selected shape and size,separate air and liquid passages between said first connectionpassageway and the lower side of said inlet opening, a separableconnection member complementary to said inlet opening, interferencemeans for ensuring that only a connection member of predetermined formcan enter said inlet opening, means securing said connection member insaid inlet opening, a flexible conduit carrying said connection memberat a first end thereof, said conduit comprising an air flow passage anda liquid flow passage, said connection member when secured in said inletopening connecting said air and liquid flow passages of said conduitrespectively with said air and liquid passages between said firstconnection passageway and said inlet opening, a screw-on cap at a secondend of said flexible conduit for attachment to a liquid containingbottle having a predetermined form of screw-threaded neck, a secondconnection passageway below said first connection passageway allowingflow of liquid from the body to the unit, an outlet opening in said unitlocated below said second connection passageway, said outlet openingcommunicating with said second connection passageway, said outletopening being complementary to said inlet opening and havinginterference means for ensuring that only said connection member of saidpredetermined form can enter said outlet opening to connect said secondconnection passageway to said liquid flow passage in said conduit todrain liquid from said body, and a valve in said unit to control liquidflow through said second connection passageway.